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A method for optimizing reactive power output of doubly-fed wind farms during system recovery

A technology of system recovery and doubly-fed wind turbines, applied in the field of power grids, can solve problems such as high configuration costs, increased construction costs of wind farms, and failure to fully utilize the reactive power adjustment capabilities of doubly-fed induction wind turbines.

Inactive Publication Date: 2020-09-01
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, this method not only does not give full play to the fast and flexible reactive power adjustment capability of the doubly-fed induction wind turbine, but also greatly increases the construction cost of the wind farm due to its high configuration costs.

Method used

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  • A method for optimizing reactive power output of doubly-fed wind farms during system recovery
  • A method for optimizing reactive power output of doubly-fed wind farms during system recovery
  • A method for optimizing reactive power output of doubly-fed wind farms during system recovery

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Embodiment 1

[0099] Taking the IEEE10-machine 39-node system as an example, the power grid topology is as follows: image 3 As shown, unit 30 is a hydroelectric unit with self-starting capability, and the rest are thermal power units without self-starting capability. Assume that at the current time step, apart from the self-starting units, units 37, 38, and 39 have recovered, image 3 The middle thick solid line is the recovered path. The small system that has been restored provides plant power for unit 33, and nodes 26, 27, and 16 are connected to wind farms, marked as W.

[0100] (1) Parameters of 1.5MW double-fed fan

[0101] Under the condition of knowing the active output of the fan, it is necessary to determine the adjustment range of the maximum reactive output. The relevant parameters of the 1.5MW type fan are shown in Table 1 by consulting the literature.

[0102] (2) Determine the reactive power adjustment range of the wind field under different wind speed fluctuations

[010...

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Abstract

The invention discloses a double-fed wind farm reactive output optimization method in a system recovery process. The method is characterized in that reactive optimization of a recovered system is performed by employing a reactive adjusting capability of a double-fed wind turbine. The method includes following steps: step 1, performing analysis and deduction on a mathematical model of a double-fedwind farm to obtain a P-Q curve thereof and a quantitative relation between an active output and a reactive output thereof; step 2, establishing a double-fed wind farm reactive output optimization model which regards minimum system loss and node voltage deviation as the target by regarding the reactive adjusting range of the double-fed wind turbine and the system power flow constraint as constraint conditions; and step 3, solving the reactive optimization model by employing an artificial bee colony algorithm to obtain a system wind power reactive investment scheme. According to the double-fedwind farm reactive output scheme obtained by employing the method, the active loss and the node voltage deviation value of the recovered system can be greatly reduced, and the safety constraint of a power grid in a system recovery process can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of power grids, and in particular relates to a method for optimizing reactive power output of a doubly-fed wind field during system recovery. Background technique [0002] In recent years, wind power, as the most promising renewable energy power generation technology, has developed rapidly in China. Due to the randomness and intermittent characteristics of wind energy, the problem of reactive power and voltage under high wind power penetration is one of the most prominent problems in the current grid-connected operation of wind farms. [0003] At present, domestic newly-built wind farms mainly use variable-speed constant-frequency double-fed induction wind turbines. Usually, large-capacity capacitor banks or static var compensation devices are installed on the outlet bus of the wind farm to adjust the grid-connected point voltage. However, this method not only does not give full play to the fast and flexibl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/46H02J3/18H02J3/06
CPCY02E10/76Y02E40/30
Inventor 李凯嵘景星烁李超康杰蔡胜黄琳雁陈晞
Owner NANJING UNIV OF SCI & TECH
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